Khalid Arafa

Senior web and mobile development for teams that need reliable CRM, ERP, and automation systems.

Remote · Worldwide

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What I Build

Custom CRM Systems
ERP Platforms
Workflow Automation
Web & Mobile Apps
AI Integrations

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Open for selected freelance and long-term product engagements.

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Blog

Engineering insights on CRM, ERP, AI automation, and scalable product delivery

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DevOpsby Khalid Arafa

Redis Pub/Sub vs Caching vs Rate Limiting: When to Add Each Layer

Redis can cache reads, enforce shared limits, or broadcast events—but each solves a different problem. Learn when to add each layer and when not to.

Rate Limiting and Caching at the API Gateway Layer: Protecting Your Backend From Its Own Traffic

Most outages aren't attacks, they're your own traffic overwhelming itself. A concept-first look at how rate limiting and caching work together at the API gateway to keep one misbehaving client, integration, or traffic spike from degrading service for everyone else.

The Backup Strategy That Actually Protects Your VPS Data (And Why Automation Isn't Optional)

Manual backups fail under pressure, and unmonitored automated ones fail silently. A layered VPS backup strategy, the 3-2-1 rule, application-aware dumps, encrypted off-site transfer, dead-man's-switch monitoring.

Backup Strategy for a Dockerized MongoDB Replica Set: Disaster Recovery You've Actually Tested

A replica set isn't a backup — it protects against a dead node, not a dropped collection or a bad migration. Here's the mongodump/oplog setup I actually run against a Dockerized MongoDB replica set, why restore testing is the step everyone skips, and when to graduate to filesystem snapshots or PBM i

Building My Own Firebase Alternative (flexdocs) — Self-Hosting a Realtime BaaS with Docker, Nginx & MongoDB

I built my own self-hosted Firebase alternative to escape Firebase pricing and lock-in. Meet flexdocs — a realtime BaaS on Docker, Nginx & MongoDB.

How to Dockerize an Application in 15 Minutes: A Practical Walkthrough

Learn how to dockerize an application step by step: write a lean Dockerfile, ignore junk, build a small image, and run your whole stack with one command.

How to Automate SSL Certificates in Docker for Free Forever

Automate free SSL certificate renewal in Docker with Certbot and Nginx. Set it up once, renew forever, zero downtime.